help asap Solvent passes through a column in 3.0 min but the solute requires 9.0 min. What is the capacity factor of the

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Solvent passes through a column in 3.0 min but the
solute requires 9.0 min. What is the capacity factor of the
solute?
2.0
1.5
0.70
0.50
4.0
Compounds A and B absorb in the UV region. Compound A
exhibits an absorption maximum at 267 nm (a=157) and a trailing
shoulder at 312 nm (a=12.6). Compound B has an absorption maximum
at 312 nm (a=186) and does not absorb at 267 nm. A solution
containing the two compounds exhibits absorbances (using a 1-cm
cell) of 0.726 and 0.544 at 267 and 312 nm, respectively. What is
the concentration of B in mg/L?
4.26×10−3 mg/L
3.46×10−3 mg/L
2.61×10−3 mg/L
2.16×10−3 mg/L
5.02×10−2 mg/L
4.62×10−3 mg/L
When a fluoride selective electrode was immersed in a
solution that is 1.0 x 10-4 M in F-, the potential that developed
(versus SCE) was 41.5 mV. What will be the potential that will
develop if the same electrode is immersed in a solution that is 5.0
x 10-5 M in fluoride?
59 mV
32 mV
51 mV
47 mV